Questions tagged [torque]

For questions about torque as it relates to electronics. Consider using in conjunction with related tags such as "motor" (and more specific motor-related tags), if applicable.

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Why does this DC motor increase in current and then decrease as the speed increases?

Well, the general answer to this is that as the motor needs to overcome the inertia from its state of rest, it requires high starting torque and aka high current is consumed to do that work. On the ...
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How to calculate torque of a three-phase induction motor?

I have a three-phase induction machine with following nameplate data: \$V_{s_n}=\frac{425}{\sqrt{3}}\,\mathrm{V}\$ - effective value of the phase voltage, \$f_n=70\,\mathrm{Hz}\$ - nominal frequency, \...
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Using a BLDC for variable counter-torque

I have a project in mind where rather than using weights for resistance in exercise training, I would use a BLDC for resistance. I want to have a pulley system hooked up to a BLDC, similar to the ...
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How to calculate breakdown torque for this question

I have been following the lecture notes for these three slides: I applied the equation for the question below: The answer given for the breakdown torque for this question is 572.5 Nm. I have plugged ...
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DC Motor Time to Attain Full Speed Formula Origin

There is no formal discussion but I see a formula that relates the average available torque to moment of inertia in problems from Electrical Technology by Theraja. I have tried searching about this ...
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1 answer
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Transfer function of two frequency spectra

When you have two amplitude frequency spectra (fourier spectrum), in this case of a torque ripple, how do you define the transfer function (or the ratio) between both? How do you "divide" ...
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3 answers
139 views

Why does higher voltage produce better torque from stepper motors?

I'm working with stepper motors and I have a question. I have found that if I use a higher voltage switching source, I get better torques from the motor. Why is this?
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1 answer
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Can you use a DC brushless motor as a torque motor?

I've got an outrunner brushless DC motor (Flipsky 63100 190KV 5500W if that's relevant). It'll be used to spin normally sometimes, but I also need it at other times to give resistance to motion. ...
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Choosing a motor

Long time listener, first time caller etc! Also, if you think this could be better answered somewhere else please let me know. I'm building a pottery wheel at the moment and I'm in a bit of a quandary ...
2 votes
1 answer
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Some doubts regarding electronic throttle motor

I am trying to wrap my head around the working of electronic throttle bodies. So they usually have a brushed Permanent Magnet DC Motor which actuates the throttle plate (butterfly valve) via a gear ...
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1 answer
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Electrical torque and electrical power of a generator?

Having the electrical torque and the angular speed of a synchronous generator, can I calculate its electrical power output as the product between the electrical torque and its angular speed w (Pe=Tew) ...
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Fundamental understanding of motor torque

I have the following elementary question regarding motors: Motors provide mechanical torque as output. Every motor has a particular torque-speed characteristic curve which tells us how much torque the ...
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What is the effect of the capacitor on the input power and torque of permanent split capacitor (PSC) single phase induction motor?

I need to know the effect of the capacitor on the input power and torque of a permanent split capacitor (PSC) single phase induction motor.
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Need to limit the torque on a spooler

I'm a newbie to DC motors. I'm trying to use a geared DC motor of 150RPM 70Ncm torque to pull in rope on a small spool. The rope is being released by other equipment. This rope is being released at ...
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How to calculate torque constant and back EMF constant of a BLDC motor?

I have a BLDC motor to run for a fan. The parameters are as follows: Electrical frequency measured: 61.936 Hz Pole pairs: 8 Line voltage measured: 70.365 V RMS Line voltage peak: 99.51113732 ...
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2 answers
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How is power consumed by an induction motor calculated based on speed (from a VFD) and torque induced by the rotor shaft?

I've been tasked with carrying out some design improvements on my company's production floor. There is a flat belt conveyor assembly line, whose movement forward movement is controlled by a single ...
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How to check for the specification of the motor to lift a certain weight? [duplicate]

I'm trying to figure out how much power, torque and rpm required for a motor to carry 2-3 kg (including his own weight). Also, the speed at which the weight is lifted doesn't really matter as much as ...
1 vote
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How to obtain torque constant for stepper motor?

I want to measure the torque constant of a stepper motor but seems I am doing it wrong. I have an MST342C02 stepper motor (200 step/rev and 4 phases) with SMD42C2 Driver. I have a converter that gives ...
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how do i increase torque of leadshine ES-DH2306 servo motor (hybrid motor)?

i am using leadshine ES-DH2306 servo motor it is also called as hybrid motor. the torque of this motor is 20Nm. but when we are giving the load around 7 Nm it is failing.it is giving lots of jerke. ...
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3 answers
122 views

Small brushless motors: What are the inherent trade-offs between 56V and 18V motors? [closed]

While researching tools in the quest to become a handyman, I was captivated by the fact that one of the top brands sells 54V (60V max) cordless power tools while another sticks to 18V. Two questions ...
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Stepper motors both rated for higher current but the NEMA 23 stops and the NEMA 17 keeps going, could it be a (hardware) low quality motor issue?

I am using the DRV8825 stepper motor driver. The NEMA 17 is rated for 1.2 A and the NEMA 23 I'm using says it's rated for 2A. I have two NEMA 23s and they both soon choke out (stop moving). When I was ...
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Q: Motor sizing for reeling application

I would like to ask for some help. My application is regulation of vertical speed of the camera, which is mounted on winding/unwinding reel. The camera follows the object (which moves vertically). The ...
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4 votes
1 answer
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Motor torque control with PWM : how to measure current?

For my caving robot project, I have 8 motors for which I need torque control (they will mainly be stalled or nearly stalled.) Each motor is driven by a DRV8801PWPR H-bridge (commanded by one digital ...
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Get high torque out of stepper motor

I have a project where I need to lift about 2 kg about 15 cm above the ground with a stepper motor. I understand the holding torque can be calculated force times distance. So that would give me ...
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What type of motor should I use in a conveyor and how should I design it?

I need to motorize the following conveyor : It consists of 2 rolls and 9 round belts. The length L is 50 cm, the width l is 20 cm and the rolls have a radius r of 3 cm. Only the first roll will be ...
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Haptic feedback from DC motor

I want to make a simple lever connected to a DC motor pressing down on surfaces with different rigidities. I will control the lever up and down to the same position while observing the torque (or ...
1 vote
4 answers
414 views

How can power in a DC motor increase when current decreases?

In many graphs for DC motor torque speed power and other characteristics we can clearly see that as the speed of the motor increases the torque decreases, because back emf increases and torque depends ...
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1 answer
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How to find BLDC motor power and torque rating with torque constants and other given parameters

I am currently working on simulating a solar pv fed bldc motor in simulink software. I have the datasheet values of bldc motor from a iet journal as Number of poles, P = 6; rated speed, Nrated = 3000 ...
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1 answer
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What happens to the permanent magnet flux of this synchronous motor?

Considering a synchronous motor with permanent magnets (1 pair) If there is a synchronous motor with permanent magnets and I was given the initial permanent magnet flux Y_mp = e0(at 15 rps) / w (at 15 ...
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1 vote
2 answers
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What is this torque I am measuring?

I have a small brushless motor running at 3 V and a cardboard disc (about 5.5 cm radius, 3 mm thick) which can be attached and detached from the shaft of the motor. When the disc is not attached the ...
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2 answers
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How can I find the torque of a DC 6V brushed motor in a hair trimmer? [closed]

How to find hair trimmer motor start torque and power for a DC 6V 6000 RPM motor?
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2 votes
2 answers
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DC motor: why is torque NOT DEPENDENT on the angle of rotation?

I am reading a book on control systems where they take an example of an armature controlled DC motor. Because the goal is to describe constructing a block diagram from the system equations, the ...
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1 answer
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Will reducing the back EMF on a running motor increase its torque? [closed]

Will placing a diode across a DC motor after it has started running reduce or even remove the back EMF to allow the motor to achieve higher torque at higher RPMs? I know the motor will begin heating, ...
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How are real-time speed and torque of a brushless DC motor computed?

Let's suppose I need to work with a three-phase brushless DC motor. The DC motor has only three wires to control its 3 phases, there is no other wires (no Hall effect sensor return for example). ...
1 vote
2 answers
115 views

3 phase electric motor torque output

I am a mechanical engineer and fairly new to real life usage of electric motors. I have a 2.2 kW 3 phase AC motor. At 1450 rpm, it can generate 14.49 Nm torque (I understand this is called nominal ...
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1 vote
1 answer
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Motor torque sensing via current with PWM driver

What is the correct way to do torque sensing on a DC motor being driven by a PWM driver? For a constant current it's assumed that torque is roughly proportional to current but in the case of a PWM ...
-2 votes
1 answer
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What is the effect on speed and power when we connect three motors on a single shaft? [closed]

Rolls Royce used three 750R (YASA) motors in their aircraft "Ionbird." All motors are mounted on the same propeller shaft. What is the effect on the overall speed and power of the motors? ...
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1 answer
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How much weight can this DC motor and wheel combination carry? [closed]

I'm trying to make a RC Car with a total weight around 1kg. It will be 4-wheel drive with differential drive algorithm. The count of motors will be 4 DC motors simply. I have chosen the following ...
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2 answers
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Motor controller structure for constant torque starting and then switching to constant speed

I need to design a field-oriented-control (FOC) controller for a permanent magnet synchronous motor (PMSM) with position sensor. In the starting process where the motor goes from zero speed to rated ...
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3 answers
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How to power (from AC) & set varying overcurrent limits on the fly for 12 V DC motor

I am trying to use a 12 V geared down (high torque, low speed) motor in an exercise application. I want to be able to roughly adjust the load akin to adding more physical weights on a traditional ...
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1 answer
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DIY Ebike BLDB motor controller, low torque, is it my motor?

I've designed a 3 phase inverter for driving a BLDC hub motor. The design (if anyone wants to look at schematics, is here). This works well, the motor spins up and down fine, no worries. However, if I ...
4 votes
4 answers
798 views

Can I use stall torque to calculate torque constant?

I'm using torque control for my project, and dc motor manufacturer doesn't give me the number of their motor's torque constant and motor resistance. I can use multimeter to measure the motor's ...
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3 answers
417 views

How can this BLDC motor have constant torque over its RPM range?

I was going through this catalogue of BLDC motors for my EV project. I found two motors in it, one rated at 2.5 kW of peak power, and the other 6 kW of peak power. My questions are as follows: It is ...
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Torque developed by Star Connected rotor

The current in each phase of a Y-connected rotor winding is 200 amperes. The resistance per leg is 0.003 ohm. Determine the torque developed by the rotor at a slip of 3%. I don't understand how to ...
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1 answer
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Motor power, torque and RPM importance (simulator steering wheel) [closed]

I would like to build a DIY racing simulator steering wheel very similar to this one. My question is, how will the specifications of the motor used affect the experience at the wheel after the pulley ...
0 votes
1 answer
114 views

How to determine if a motor will be powerful enough to drive a drift trike

I am planning on building a drift trike and I am trying to work out the best motor to use that is right for my budget. I have seen: a 2000w (48v - 4300RPM - 4.44 N.m torque) a 1000w (48v - 3000 RPM -...
5 votes
3 answers
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About the torque-free charging operation

I and one of my friends are working on understanding the below context (paper link): The study provides an extensive overview of on-board integrated chargers for electric vehicles that are based on ...
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Why don't I get a bell curve in the torque vs rotor position plot?

I have designed a inset PMSM. I tried to plot the torque vs. rotor position plot but I am not getting a bell curve. Like at the torque must be maximum only when theta is 90 degrees. I don't know where ...
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3 answers
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Is it best practice to use motor drivers that supply continuous current greater than the stall current of the motor?

Note I am a beginner :) I have this 300RPM motor: https://uk.banggood.com/CHIHAI-MOTOR-GM25-370-DC-Gear-Motor-6V-100210300RPM-Encoder-Motor-p-1016183.html?cur_warehouse=CN&ID=519629&rmmds=...
1 vote
2 answers
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Underwater train project's battery powered DC/BLDC/Stepping motor gear/non gear requirements and water proof sealing problem

I am a software developer by trade, having put together a few beginner Arduino projects and such. My next project entails an underwater roller-coaster (without loops, just going over the surface, so ...
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